topic Re: difference between i and u modifiers? in SAS Programming

difference between i and u modifiers?

xxformat_com — Fri, 15 Sep 2023 08:32:04 GMT

Hi,

Can you think of any case where the i modifier would give a different result from the u modifier?

- i ignores case

- u adds uppercase letters to the list of characters

Just an example with countc, but it could be with any function allowing these modifiers.

data test;
    length x $12;
    x='bca1-abcABC2';

    countc_x_abc_i=countc(x,'abc','i');
    countc_x_abc_u=countc(x,'abc','u');
run;

proc print data=test;
run;

Re: difference between i and u modifiers?

yabwon — Fri, 15 Sep 2023 08:51:38 GMT

data test;
    length x $12;
    x='bca1-abcABC2';

    countc_x_abc_i=compress(x,'a','i');
    countc_x_abc_u=compress(x,'a','u');
run;

proc print data=test;
run;

Re: difference between i and u modifiers?

FreelanceReinh — Fri, 15 Sep 2023 08:53:32 GMT

Hi @xxformat_com,

Example 1:

x='bca1-abcABD2';

Then your COUNTC calls would yield 8 vs. 9 because the second counts the "D" (all uppercase letters were added to the initial list consisting of "a", "b" and "c"), whereas the first does not (only "a", "b", "c", "A", "B" and "C").

Example 2:

Leave x unchanged, but change the second argument of the COUNTC calls to 'abd'. Then you get 6 vs. 7 for similar reasons.